BIKERELIABILITY
MOT DATA · GREAT BRITAIN · 2005–2025
League table/ AJS/DD 250 S-9B
Model report · 2005–2025

AJS DD 250 S-9B

234cc Petrol Class 2
#4311 of 5426 overall #17 of 45 AJSs #2661 of 2787 other bikes
74.9%
first-time pass rate
14.4%
failed outright
4,592
median miles at test
215
MOT tests, 2005–2025

What fails on a DD 250 S-9B

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects
lighting and signalling
16 27.6
tyres and wheels
10 17.2
lamps and reflectors
9 15.5
brakes
9 15.5
drive system
6 10.3
steering and suspension
4 6.9
Identification of the vehicle
1 1.7
reg plates and vin
1 1.7
structure and attachments
1 1.7
suspension
1 1.7

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the DD 250 S-9B beats 0 of its 4 closest rivals (YAMAHA YP250, YAMAHA WR250F, HONDA XR250).

Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the DD 250 S-9B.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 2007 (73.4% pass). Weakest: 2006 (71.2%).

70%72%74%2006: 71.2% pass (52 tests)2007: 73.4% pass (128 tests)20062007

First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.